Sensors PG1 | Data sheet No. 13170 | Version 03-2020 |
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Volume flow indicator / monitor / transmitter SENSO-X® VPX
Example of Modbus telegram (hexadecimal notation)
Request:
Tx:[time stamp]- 01 03 00 05 00 02 D4 0A
from left to right:
“01” = Modbus address of SENSO-X, here = 1
“03” = function code “Read holding register”
“00” = high byte of start register (1st register to be read out), here = 0
“05” = low byte of start register, here register no. 5 = flow / volume flow, low word
“00 02” = number of registers read, here = 2
“D4 0A” = CRC
Response – flow / volume flow
Rx:[time stamp]- 01 03 04 0C B6 00 01 D9 45
from left to right:
“01” = responding Modbus address, here = 1
“03” = function code
“04” = number of response data bytes, here = 4
“0C” = high byte of 5th register, here = 0x0C00h = 3,072d
“B6” = low byte of 5th register, here = 0xB6h = 182d -> 182 + 3,072 = 3,254 m³/h
„00“ = high byte of 6th register, here = 0x000000h = 0d
„01“ = low byte of 6th register, here = 0x010000h = 65,536d -> 65,536 + 3,254 = 68,790 m³/h
“D9 45” = CRC
7 (0x07)
40008
unit of measure
unsigned 16
4, 5 or 6
4: ft³/min
5: l/s
6: m³/h
8 (0x08)
40009
range max
(low word)
unsigned 32
0 to 65,535
Set limit value in selected unit
of measure, see register 7, e.g.
0 to 99,999 m³/h
9(0x09)
40010
range max
(high word)
0 or 1
10 (0x0A) 40011
ρ (Rho)
unsigned 16
0 to 200
air density in kg/m³ (default 1.15)
0 to 2.00
11 (0x0B) 40012
K-factor
unsigned 16
0 to 65.535
correction factor (default 500,0)
0 to 6.553,5
12 (0x0C) 40013
temperature
signed 16
-300 to 1,050
temperature on circuit board in
1/10°C from -30 to 105 °C
13 (0x0D) 40014
atmospheric
pressure
unsigned 16
2,600 to 12,600
absolute atmospheric pressure
in housing in 1/10 hPa from
260 hPa to 1,260 hPa
14 (0x0E) 40015
sensor error
unsigned 16
0 or 1
0 = no sensor error
1 = sensor error
15 (0x0F) 40016
measured limit
unsigned 16
0 to 100
0 to 100 %
16 (0x10) 40017
state of
switching output
unsigned 16
0 or 1
0 = inactive
1 = active
17 (0x11) 40018
LED status
unsigned 16
0 to 3
0 = LED off
1 = green
2 = yellow
3 = red
18 (0x12) 40019
firmware version
unsigned 16
1.0.1.1 and higher
“1018” means FW version 1.0.1.8
19 (0x13) 40020
type
unsigned 16
0 bis 4
0 = PPX1000
1 = PPX4000
2 = VPX1000
3 = VPX4000
20 (0x14) 40021
Modbus Address
unsigned 16
1 to 127
1 to 127
21 (0x15) 40022
Fan manufacturer
Unsigned 16
0 to 3
0 = A (ebm-pabst, Ziehl-Abegg)
1 = B (Fläkt)
2 = C (Nicotra Gebhardt, Rosenberg)
3 = D (unassigned/universal)
22 (0x16) 40023
Number of fans
Unsigned 16
1 to 20
Number of fans in the fan grid
